<div class="css-s99gbd StoryBodyCompanionColumn" data-testid="companionColumn-0"><div class="css-53u6y8"><p class="css-ac37hb evys1bk0">Evelin and Gustavo Quebedo, have filed U.S. tax returns every year for more than a decade.</p><p class="css-ac37hb evys1bk0">That they are undocumented immigrants did not deter them.</p><p class="css-ac37hb evys1bk0">“Our thinking has been, if one day there’s immigration reform and the chance to legalize our status, we can show that we file our taxes, are not a burden — that we do the right thing,” said Mr. Quebedo, a car mechanic, who lives with his family in Los Angeles.</p><p class="css-ac37hb evys1bk0">But as April 15 approached this year, the couple, who came to the United States from Central America, agonized over whether to file.</p><p class="css-ac37hb evys1bk0">Their fears, shared by many of the millions of undocumented people who file tax returns, are rooted in the decision last year by the Internal Revenue Service to give immigration officials the addresses of people subject to deportation — a break with the tax agency’s longstanding practices.</p></div><aside aria-label="companion column" class="css-ew4tgv"></aside></div><div data-testid="Dropzone-1"></div><div class="css-s99gbd StoryBodyCompanionColumn" data-testid="companionColumn-1"><div class="css-53u6y8"><p class="css-ac37hb evys1bk0">The shift sent shock waves through the I.R.S., where taxpayer privacy has been an article of faith, and through immigrant communities, where filing tax returns was seen as a way for people in the country illegally to show that they were complying with tax laws.</p><p class="css-ac37hb evys1bk0">The federal treasury could take a hit. Many undocumented immigrants have taxes withheld in every paycheck, but experts worry some could shift into under-the-table jobs. Others with less formal earnings may now skip filing a tax return — and therefore not pay federal taxes at all. The Yale Budget Lab, a nonpartisan research center, projected lost tax revenue of about $300 billion over a decade.</p><div class="css-kbghgg"><div class="css-121kum4"><div class="css-171d1bw"></div><div class="css-asuuk5"><noscript><div class="css-7axq9l" data-testid="optimistic-truncator-noscript"><svg aria-hidden="true" class="css-1b5b8u1" data-tpl="i" height="24" viewbox="0 0 24 24" width="24"><path clip-rule="evenodd" d="M2.5 12a9.5 9.5 0 1 1 19 0 9.5 9.5 0 0 1-19 0Zm8.5 1.75v-7.5h2v7.5h-2Zm0 2v2h2v-2h-2Z" fill="currentColor" fill-rule="evenodd"></path></svg><div class="css-6yo1no" data-testid="optimistic-truncator-noscript-message"><p class="css-3kpklk" data-tpl="t">We are having trouble retrieving the article content.</p><p class="css-3kpklk" data-tpl="t">Please enable JavaScript in your browser settings.</p></div></div></noscript><div class="css-1dv1kvn" id="optimistic-truncator-a11y" tabindex="-1"><hr/><p>Thank you for your patience while we verify access. 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